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Finding the Fourth Proportional to 881.70, 1,216.77 and 488.70

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Solution

The fourth proportional to 881.70, 1,216.77 and 488.70 is: 674.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.70 : 1,216.77 = 488.70 : x
  2. Step 2: Convert to fraction form
    881.70/1,216.77 = 488.70/x
  3. Step 3: Cross multiply
    881.70x = 1,216.77 × 488.70
  4. Step 4: Simplify right side
    881.70x = 594,635.50
  5. Step 5: Solve for x
    x = 594,635.50/881.70
  6. Step 6: Final answer
    x = 674.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.